/*字体样式*/
.my_font{
    font-style: italic;
    font-weight: bolder;
    font-size: 2.75em;
    font-family: 华文中宋,Serif;
    line-height: 5rem;/* 5px*16=80px*/
    /*line-height: 5em;*//*  5*font-size(2.75em) = 5*2.75*16px = 220px*/
}

/*文本样式*/
.my_text {
    border: 1px solid black;
    width: 30rem;
    height: 10rem;
    letter-spacing: 1rem;
    line-height:2rem ;
    text-indent:1rem ;
    text-align: center;
    vertical-align: middle;
}
.my_color{
    border: 1px solid black;
    width: 39rem;
    height: 10rem;
    color: blue;
}
.my_bg{
    border: 1px solid black;
    width: 50rem;
    height: 20rem;
    background: #c82333 url("https://www.baidu.com/img/bd_logo1.png");
}
.my_list{
    list-style-type: none;
    list-style-image: url("http://www.jju.edu.cn/images/banner201801.jpg");
}
.my_box{
    border: 1px solid black;
    width: 50rem;
    height: 20rem;
    margin: 1rem 1rem;
    padding: 1rem;
}